Every and some in javascript

Last night when working through the simple cipher exercise on exercism.io, I submitted a solution that an array filter to find characters that I didn’t want in an array.

const validateKey = (key) => {
  const invalid = key.split('').filter(val => !values.includes(val));

  if (invalid.length) {
    return false;
  };

  return true;
}

This seemed clunky because I didn’t need to find all the values that were invalid, I only needed to find one to throw an error.

I found the find array function which was an improvement.

Fortunately I got feedback from mgmatola that clued me in to the every() and some() array functions.

Using these clarified my intent that I am looking for exceptions rather than the rule.

const validateKey = (key) => {
  return key.split('').every(val => values.includes(val));
}